Lake Sule is a 77-acre man-made lake located at the junction of I-39 and I-88 southeast of Rochelle in Ogle County, Illinois. Originally constructed as a borrow pit for overpass construction beginning in 1979, the lake was formed in January 1982 and dedicated as Lake Sule in the Lyle Kundy recreational area in 1996. This relatively shallow lake features a maximum depth of 15 feet with an average depth of 8.5 feet, maintaining a nearly rectangular shape with 1.4 miles of shoreline and no significant bays or indentations. The lake contains approximately 653.7 acre-feet of water and is managed by the Flagg-Rochelle Park District as a public fishing destination.